/Engine/Source/Runtime/MeshDescription/Public/MeshDescription.h
Populates the passed array with adjacent polygons
template<typename Alloc> void GetPolygonAdjacentPolygons ( const [FPolygonID](API\Runtime\MeshDescription\FPolygonID) PolygonID, [TArray](API\Runtime\Core\Containers\TArray)< [FPolygonID](API\Runtime\MeshDescription\FPolygonID), Alloc > & OutPolygonIDs ) const